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データシートサーチシステム |
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TRM-915-R250 データシート(PDF) 23 Page - Linx Technologies |
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TRM-915-R250 データシート(HTML) 23 Page - Linx Technologies |
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23 / 39 page  – – – – 40 41 Maximum Transmit Retries - Address = 0x52; NV Address = 0x07 regMAXTXRETRY sets the number of transmission retries if an acknowledgement is not received. If an acknowledgement is not received after the last retry, EX_NORFACK is raised. Figure 38 shows examples of the command. The time between retries depends on the current baud rate. Figure 39 shows the time between retries based on baud rate. The retry number times the timeout times gives the potential latency before a new message can be sent. Figure 38: 250 Series Maximum Transmit Retries Command and Response 250 Series Acknowledgement Timeout Times Baud Rate Timeout Time 2400 170ms 9600 75ms 19200 45ms 38400 30ms 57600 30ms 115200 30ms Figure 39: 250 Series Acknowledgement Timeout Times 250 Series Maximum Transmit Retries Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x52 0x07 0x06 0x52 0x07 V1 Write Command Header Size Address Value 0xFF 0x02 0x52 0x07 V1 Transmit Wait Timeout - Address = 0x50; NV Address = 0x05 When a byte is received from the UART, the module starts a timer that counts down every millisecond. The timer is restarted when each byte is received. The value for the regTXTO register is the number of milliseconds to wait before transmitting the data in the UART receive buffer. The default setting for this register is 0x10 (~16ms delay). If the timer reaches zero before the next byte is received from the UART, the module begins transmitting the data in the buffer. This timeout value should be greater than one byte time at the current UART data rate with a minimum of 0x02. It should not be set to a value of 0x01 or any value less than one byte time as unpredictable results could occur. If the timeout value is set to 0x00, the transmit wait timeout is deactivated. In this case, the transceiver waits until a number of bytes equal to the Minimum Transmission Unit (MTU) have been received by the UART. All of the bytes are sent once the MTU has been reached. Figure 36 shows examples of the commands. Figure 37 shows the minimum timeout values based on baud rate. Figure 36: 250 Series Transmit Wait Timeout Command and Response 250 Series Minimum TXTO Values Baud Rate Minimum TXTO 2,400 6ms 9,600 3ms 19,200 2ms 38,400 2ms 57,600 2ms 115,200 2ms Figure 37: 250 Series Transmit Wait Timeout Minimum Values 250 Series Transmit Wait Timeout Read Command Read Response Header Size Escape Address ACK Address Value 0xFF 0x02 0xFE 0x50 0x05 0x06 0x50 0x05 V1 Write Command Header Size Address Value 0xFF 0x02 0x50 0x05 V1 |
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